which coincides with the optimal for \(v=0\) . For \(v>0\) , however, and unlike in the ideal case, the tradeoff between \(c_{ab}\)  and \(F_g\)  is not necessarily above the noncontextual bound. For example, for \(v=0.015\)  a violation can be observed only for \(c_{ab} \in [0.318,0.718]\) , see Fig. REF . Nevertheless, a preliminary comparison with the experimental results of Ref. [1]} suggests that the required low level of noise is not beyond current experiments. In fact, in terms of the parameter \(C_s = 1/2\, p(M_s|P_s) + 1/2\, p(M_{s^\perp }|P_{s^\perp })\)  defined in Ref. [1]} (\(C_s= 1\)  in the ideal scenario), \(v=0.015\)  corresponds to \(C_s \approx 0.9851\)  for \(s=a,b\)  and \(C_s \approx 0.9667\)  for \(s=aa,bb\) , and Ref. [1]} experimentally realized \(C_s=0.9969\) .
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